Myopia: Near-Sightedness Explanation

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Questions and Answers

What is another name for myopia?

  • Astigmatism
  • Hypermetropia
  • Near-sightedness (correct)
  • Presbyopia

In myopia, where is the image of a distant object formed in the eye?

  • Behind the retina (correct)
  • At the back of the eye lens
  • On the retina
  • At the far point

What type of lens can be used to correct myopia?

  • Cylindrical lens
  • Plano-concave lens (correct)
  • Bifocal lens
  • Convex lens

How does myopia affect a person's ability to see objects at different distances?

<p>Clear vision only for nearby objects (D)</p> Signup and view all the answers

What can cause myopia to develop in an individual?

<p>Elongation of the eyeball (A)</p> Signup and view all the answers

Flashcards

Myopia

Nearsightedness, a condition where close objects are seen clearly, but distant objects appear blurry.

Image Formation in Myopia

In front of the retina, instead of directly on it, causing blurred vision for distant objects.

Myopia Correction Lens

A diverging lens that spreads light rays to focus the image correctly on the retina.

Myopia Vision

A person with myopia has difficulty seeing distant objects clearly, but can see near objects without issue.

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Cause of Myopia

An increase in the eye's axial length, causing light to focus improperly.

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Study Notes

Myopia (Nearsightedness)

  • Myopia is a defect in which a person can see nearby objects clearly but cannot see distant objects distinctly.
  • In a myopic eye, the far point is nearer than infinity, and the person may see clearly up to a distance of a few meters.
  • The image of a distant object is formed in front of the retina, not at the retina itself.
  • Myopia can arise due to:
    • Excessive curvature of the eye lens
    • Elongation of the eyeball
  • This defect can be corrected by using a concave lens of suitable power.
  • A concave lens of suitable power will bring the image back onto the retina, thus correcting the defect.

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